package cn.web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class HelloServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public HelloServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
		// super.service(arg0, arg1);
		// super.do
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
		//
		// response.setContentType("text/html;charset=utf-8");
		// PrintWriter out = response.getWriter();
		// out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01
		// Transitional//EN\">");
		// out.println("<HTML>");
		// out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		// out.println(" <BODY>");
		// out.print(" This is ");
		// out.print(this.getClass());
		// out.println(", using the GET 请求");
		// out.println(" </BODY>");
		// out.println("</HTML>");
		// out.flush();
		// out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ServletContext sc = super.getServletContext();
		sc.setAttribute("msg", "中秋放假，9-13到9-15");
		request.setCharacterEncoding("utf-8");
		String n = request.getParameter("uname");
		String p = request.getParameter("pass");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		//
		if (n.startsWith("liu") && p.equals("123456")) {
			HttpSession s = request.getSession();
			s.setAttribute("USER_LOGIN", n);
			response.sendRedirect("welcome.jsp");
			return;
		} else {
			// request.setAttribute("msg", "错误的密码或者用户名");
			// request.getRequestDispatcher("/posttest.jsp").forward(request,
			// response);

			out.print("<script>alert('错误的密码或者用户名');history.back();</script>");
		}
		//
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", 这是post请求");
		out.println("<br/>" + n + "，上午好");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();

	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
